/*
  ==============================================================================

   This file is part of the JUCE framework.
   Copyright (c) Raw Material Software Limited

   JUCE is an open source framework subject to commercial or open source
   licensing.

   By downloading, installing, or using the JUCE framework, or combining the
   JUCE framework with any other source code, object code, content or any other
   copyrightable work, you agree to the terms of the JUCE End User Licence
   Agreement, and all incorporated terms including the JUCE Privacy Policy and
   the JUCE Website Terms of Service, as applicable, which will bind you. If you
   do not agree to the terms of these agreements, we will not license the JUCE
   framework to you, and you must discontinue the installation or download
   process and cease use of the JUCE framework.

   JUCE End User Licence Agreement: https://juce.com/legal/juce-8-licence/
   JUCE Privacy Policy: https://juce.com/juce-privacy-policy
   JUCE Website Terms of Service: https://juce.com/juce-website-terms-of-service/

   Or:

   You may also use this code under the terms of the AGPLv3:
   https://www.gnu.org/licenses/agpl-3.0.en.html

   THE JUCE FRAMEWORK IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL
   WARRANTIES, WHETHER EXPRESSED OR IMPLIED, INCLUDING WARRANTY OF
   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE DISCLAIMED.

  ==============================================================================
*/

namespace juce
{

static File resolveFilename (const String& name)
{
    return File::getCurrentWorkingDirectory().getChildFile (name.unquoted());
}

static File checkFileExists (const File& f)
{
    if (! f.exists())
        ConsoleApplication::fail ("Could not find file: " + f.getFullPathName());

    return f;
}

static File checkFolderExists (const File& f)
{
    if (! f.isDirectory())
        ConsoleApplication::fail ("Could not find folder: " + f.getFullPathName());

    return f;
}

static File resolveFilenameForOption (const ArgumentList& args, StringRef option, const String& filename)
{
    if (filename.isEmpty())
    {
        args.failIfOptionIsMissing (option);
        ConsoleApplication::fail ("Expected a filename after the " + option + " option");
    }

    return resolveFilename (filename);
}

File ArgumentList::Argument::resolveAsFile() const
{
    return resolveFilename (text);
}

File ArgumentList::Argument::resolveAsExistingFile() const
{
    return checkFileExists (resolveAsFile());
}

File ArgumentList::Argument::resolveAsExistingFolder() const
{
    auto f = resolveAsFile();

    if (! f.isDirectory())
        ConsoleApplication::fail ("Could not find folder: " + f.getFullPathName());

    return f;
}

static bool isShortOptionFormat (StringRef s)  { return s[0] == '-' && s[1] != '-'; }
static bool isLongOptionFormat  (StringRef s)  { return s[0] == '-' && s[1] == '-' && s[2] != '-'; }
static bool isOptionFormat      (StringRef s)  { return s[0] == '-'; }

bool ArgumentList::Argument::isLongOption() const     { return isLongOptionFormat (text); }
bool ArgumentList::Argument::isShortOption() const    { return isShortOptionFormat (text); }
bool ArgumentList::Argument::isOption() const         { return isOptionFormat (text); }

bool ArgumentList::Argument::isLongOption (const String& option) const
{
    if (! isLongOptionFormat (option))
    {
        jassert (! isShortOptionFormat (option)); // this will always fail to match
        return isLongOption ("--" + option);
    }

    return text.upToFirstOccurrenceOf ("=", false, false) == option;
}

String ArgumentList::Argument::getLongOptionValue() const
{
    if (isLongOption())
    {
        auto equalsIndex = text.indexOfChar ('=');

        if (equalsIndex > 0)
            return text.substring (equalsIndex + 1);
    }

    return {};
}

bool ArgumentList::Argument::isShortOption (char option) const
{
    jassert (option != '-'); // this is probably not what you intended to pass in

    return isShortOption() && text.containsChar (String (option)[0]);
}

bool ArgumentList::Argument::operator== (StringRef wildcard) const
{
    for (auto& o : StringArray::fromTokens (wildcard, "|", {}))
    {
        if (text == o)
            return true;

        if (isShortOptionFormat (o) && o.length() == 2 && isShortOption ((char) o[1]))
            return true;

        if (isLongOptionFormat (o) && isLongOption (o))
            return true;
    }

    return false;
}

bool ArgumentList::Argument::operator!= (StringRef s) const   { return ! operator== (s); }

//==============================================================================
ArgumentList::ArgumentList (String exeName, StringArray args)
    : executableName (std::move (exeName))
{
    args.trim();
    args.removeEmptyStrings();

    for (auto& a : args)
        arguments.add ({ a.unquoted() });
}

ArgumentList::ArgumentList (int argc, char* argv[])
    : ArgumentList (argv[0], StringArray (argv + 1, argc - 1))
{
}

ArgumentList::ArgumentList (const String& exeName, const String& args)
    : ArgumentList (exeName, StringArray::fromTokens (args, true))
{
}

int ArgumentList::size() const                                      { return arguments.size(); }
ArgumentList::Argument ArgumentList::operator[] (int index) const   { return arguments[index]; }

void ArgumentList::checkMinNumArguments (int expectedMinNumberOfArgs) const
{
    if (size() < expectedMinNumberOfArgs)
        ConsoleApplication::fail ("Not enough arguments!");
}

int ArgumentList::indexOfOption (StringRef option) const
{
    jassert (option == String (option).trim()); // passing non-trimmed strings will always fail to find a match!

    for (int i = 0; i < arguments.size(); ++i)
        if (arguments.getReference (i) == option)
            return i;

    return -1;
}

bool ArgumentList::containsOption (StringRef option) const
{
    return indexOfOption (option) >= 0;
}

bool ArgumentList::removeOptionIfFound (StringRef option)
{
    auto i = indexOfOption (option);

    if (i >= 0)
        arguments.remove (i);

    return i >= 0;
}

void ArgumentList::failIfOptionIsMissing (StringRef option) const
{
    if (indexOfOption (option) < 0)
        ConsoleApplication::fail ("Expected the option " + option);
}

String ArgumentList::getValueForOption (StringRef option) const
{
    jassert (isOptionFormat (option)); // the thing you're searching for must be an option

    for (int i = 0; i < arguments.size(); ++i)
    {
        auto& arg = arguments.getReference (i);

        if (arg == option)
        {
            if (arg.isShortOption())
            {
                if (i < arguments.size() - 1 && ! arguments.getReference (i + 1).isOption())
                    return arguments.getReference (i + 1).text;

                return {};
            }

            if (arg.isLongOption())
                return arg.getLongOptionValue();
        }
    }

    return {};
}

String ArgumentList::removeValueForOption (StringRef option)
{
    jassert (isOptionFormat (option)); // the thing you're searching for must be an option

    for (int i = 0; i < arguments.size(); ++i)
    {
        auto& arg = arguments.getReference (i);

        if (arg == option)
        {
            if (arg.isShortOption())
            {
                if (i < arguments.size() - 1 && ! arguments.getReference (i + 1).isOption())
                {
                    auto result = arguments.getReference (i + 1).text;
                    arguments.removeRange (i, 2);
                    return result;
                }

                arguments.remove (i);
                return {};
            }

            if (arg.isLongOption())
            {
                auto result = arg.getLongOptionValue();
                arguments.remove (i);
                return result;
            }
        }
    }

    return {};
}

File ArgumentList::getFileForOption (StringRef option) const
{
    return resolveFilenameForOption (*this, option, getValueForOption (option));
}

File ArgumentList::getFileForOptionAndRemove (StringRef option)
{
    return resolveFilenameForOption (*this, option, removeValueForOption (option));
}

File ArgumentList::getExistingFileForOption (StringRef option) const
{
    return checkFileExists (getFileForOption (option));
}

File ArgumentList::getExistingFileForOptionAndRemove (StringRef option)
{
    return checkFileExists (getFileForOptionAndRemove (option));
}

File ArgumentList::getExistingFolderForOption (StringRef option) const
{
    return checkFolderExists (getFileForOption (option));
}

File ArgumentList::getExistingFolderForOptionAndRemove (StringRef option)
{
    return checkFolderExists (getFileForOptionAndRemove (option));
}

//==============================================================================
struct ConsoleAppFailureCode
{
    String errorMessage;
    int returnCode;
};

void ConsoleApplication::fail (String errorMessage, int returnCode)
{
    throw ConsoleAppFailureCode { std::move (errorMessage), returnCode };
}

int ConsoleApplication::invokeCatchingFailures (std::function<int()>&& f)
{
    int returnCode = 0;

    try
    {
        returnCode = f();
    }
    catch (const ConsoleAppFailureCode& error)
    {
        std::cerr << error.errorMessage << std::endl;
        returnCode = error.returnCode;
    }

    return returnCode;
}

const ConsoleApplication::Command* ConsoleApplication::findCommand (const ArgumentList& args, bool optionMustBeFirstArg) const
{
    for (auto& c : commands)
    {
        auto index = args.indexOfOption (c.commandOption);

        if (optionMustBeFirstArg ? (index == 0) : (index >= 0))
            return &c;
    }

    if (commandIfNoOthersRecognised >= 0)
        return &commands[(size_t) commandIfNoOthersRecognised];

    return {};
}

int ConsoleApplication::findAndRunCommand (const ArgumentList& args, bool optionMustBeFirstArg) const
{
    return invokeCatchingFailures ([&args, optionMustBeFirstArg, this]
    {
        if (auto c = findCommand (args, optionMustBeFirstArg))
            c->command (args);
        else
            fail ("Unrecognised arguments");

        return 0;
    });
}

int ConsoleApplication::findAndRunCommand (int argc, char* argv[]) const
{
    return findAndRunCommand (ArgumentList (argc, argv));
}

void ConsoleApplication::addCommand (Command c)
{
    commands.emplace_back (std::move (c));
}

void ConsoleApplication::addDefaultCommand (Command c)
{
    commandIfNoOthersRecognised = (int) commands.size();
    addCommand (std::move (c));
}

void ConsoleApplication::addHelpCommand (String arg, String helpMessage, bool makeDefaultCommand)
{
    Command c { arg, arg, "Prints the list of commands", {},
                [this, helpMessage] (const ArgumentList& args)
                {
                    std::cout << helpMessage << std::endl;
                    printCommandList (args);
                }};

    if (makeDefaultCommand)
        addDefaultCommand (std::move (c));
    else
        addCommand (std::move (c));
}

void ConsoleApplication::addVersionCommand (String arg, String versionText)
{
    addCommand ({ arg, arg, "Prints the current version number", {},
                  [versionText] (const ArgumentList&)
                  {
                      std::cout << versionText << std::endl;
                  }});
}

const std::vector<ConsoleApplication::Command>& ConsoleApplication::getCommands() const
{
    return commands;
}

static String getExeNameAndArgs (const ArgumentList& args, const ConsoleApplication::Command& command)
{
    auto exeName = args.executableName.fromLastOccurrenceOf ("/", false, false)
                                      .fromLastOccurrenceOf ("\\", false, false);

    return " " + exeName + " " + command.argumentDescription;
}

static void printCommandDescription (const ArgumentList& args, const ConsoleApplication::Command& command,
                                     int descriptionIndent)
{
    auto nameAndArgs = getExeNameAndArgs (args, command);

    if (nameAndArgs.length() > descriptionIndent)
        std::cout << nameAndArgs << std::endl << String().paddedRight (' ', descriptionIndent);
    else
        std::cout << nameAndArgs.paddedRight (' ', descriptionIndent);

    std::cout << command.shortDescription << std::endl;
}

void ConsoleApplication::printCommandList (const ArgumentList& args) const
{
    int descriptionIndent = 0;

    for (auto& c : commands)
        descriptionIndent = std::max (descriptionIndent, getExeNameAndArgs (args, c).length());

    descriptionIndent = std::min (descriptionIndent + 2, 40);

    for (auto& c : commands)
        printCommandDescription (args, c, descriptionIndent);

    std::cout << std::endl;
}

void ConsoleApplication::printCommandDetails (const ArgumentList& args, const Command& command) const
{
    auto len = getExeNameAndArgs (args, command).length();

    printCommandDescription (args, command, std::min (len + 3, 40));

    if (command.longDescription.isNotEmpty())
        std::cout << std::endl << command.longDescription << std::endl;
}


} // namespace juce
